YAML to JSON Converter
Convert YAML (YAML Ain't Markup Language) to JSON format. Perfect for transforming configuration files, API responses, and data structures from human-readable YAML to machine-friendly JSON.
Conversion Options
Minify removes whitespace for smaller file size
Standard is 2 spaces
Recommended Settings
JSON Best Practices
- •Use 2-space indentation for readability (industry standard)
- •Minify JSON only for production APIs to reduce bandwidth
- •Sort keys alphabetically for consistent diffs in version control
- •JSON is ideal for APIs and data exchange between systems
- •All JSON is valid JavaScript but not all JavaScript is valid JSON
YAML vs JSON Considerations
- •YAML supports comments, JSON does not - comments are lost in conversion
- •YAML is human-friendly, JSON is machine-friendly and more performant
- •YAML uses indentation, JSON uses braces and brackets
- •Both represent the same data structures (objects, arrays, primitives)
- •Use JSON for APIs, YAML for configuration files
Pro Tips
- •All conversion happens client-side - your data never leaves your browser
- •YAML comments are ignored during parsing and won't appear in JSON output
- •YAML anchors and aliases are automatically resolved during conversion
- •Use minify option when you need compact JSON for APIs or storage
Most Popular
2-space indent without minification for readable, version-control-friendly JSON
When to Use This Tool
Convert YAML configuration or data to JSON for REST APIs. Most modern APIs accept and return JSON. Transform YAML configs into JSON payloads for HTTP requests, webhooks, or GraphQL queries.
Migrate from YAML-based systems to JSON-based databases or applications. Convert YAML data exports to JSON for MongoDB, PostgreSQL JSONB columns, or document stores that require JSON format.
Convert YAML configs to JSON for Node.js, React, or browser applications. JavaScript natively supports JSON parsing with JSON.parse(), making it faster and more reliable than YAML parsing in runtime.
Validate YAML syntax by converting to JSON. If conversion succeeds, the YAML is valid. Use this to check YAML files for syntax errors, missing colons, or indentation issues before deployment.
Convert YAML data to JSON for analysis in Python (pandas), R, or data science tools. JSON is universally supported in data processing libraries and easier to manipulate programmatically than YAML.
Sort keys alphabetically and convert to JSON for cleaner git diffs. JSON with sorted keys produces consistent output, making it easier to review changes in pull requests and track config modifications.
How It Works
Parse YAML input using js-yaml library
Validate YAML syntax and structure
Convert YAML data structures to JavaScript objects
Resolve YAML-specific features (anchors, aliases, multi-line strings)
Apply conversion options (sort keys if enabled)
Serialize to JSON using JSON.stringify()
Format with indentation or minify based on options
Output clean, valid JSON ready for use
100% Private
Files never leave your device. All processing happens locally in your browser.
Lightning Fast
Powered by Pure JavaScript for optimal performance on modern browsers.
Secure
No data collection, no tracking, no sign-up required.
Frequently Asked Questions
What happens to YAML comments during conversion?
YAML comments (lines starting with #) are ignored during parsing and do not appear in JSON output. JSON does not support comments by specification. If you need to preserve documentation, consider adding it as a separate 'description' or 'comments' field in your data structure.
How are YAML anchors and aliases handled?
YAML anchors (&anchor) and aliases (*alias) are automatically resolved during parsing. The js-yaml library expands all references, so the JSON output contains the full data structure without any anchor/alias syntax. Duplicate objects are copied in full.
What's the difference between minified and pretty JSON?
Pretty JSON includes whitespace (indentation and newlines) for readability, making it easy to read and debug. Minified JSON removes all unnecessary whitespace, creating a compact single-line string ideal for APIs, storage, or transmission to reduce file size.
Why should I sort keys alphabetically?
Sorting keys produces consistent output every time, which is valuable for version control (git diffs), testing, and comparing JSON files. It makes it easier to spot changes and ensures that identical data always produces identical JSON, regardless of original YAML key order.
How are YAML data types converted to JSON?
YAML booleans (true/false, yes/no) become JSON booleans. YAML numbers become JSON numbers. YAML strings become JSON strings. YAML dates are converted to ISO 8601 strings. YAML null becomes JSON null. YAML arrays and objects map directly to JSON arrays and objects.
Can I convert multi-document YAML files?
This tool converts the first document in a YAML file. Multi-document YAML (separated by ---) contains multiple independent documents. To convert all documents, split the file at --- separators and convert each document individually, then combine into a JSON array if needed.
Is my YAML data secure during conversion?
Absolutely! All conversion happens entirely in your browser using client-side JavaScript. Your YAML data never leaves your computer or gets sent to any server. The tool works completely offline after the page loads. No data is stored, logged, or transmitted.
What YAML version is supported?
The js-yaml library supports YAML 1.2, which is the latest specification. This includes all standard YAML features: scalars, sequences, mappings, multi-line strings, anchors, aliases, and all data types. YAML 1.2 is compatible with JSON (all JSON is valid YAML 1.2).